Hach-Lange POLYMETRON 9526 - Manual (Page 10)

Hydraulic connections
N O T I C E
Sockets No. 4, 5 and 6 in Figure 1 on page 8 are all IP 67 therefore it is essential the connectors are tightened
firmly before using the instrument. In addition, it is also important to replace the protection caps on the sockets
after use.
The sample to be tested enters the instrument through the port labelled "IN" (No. 11 in Figure 1
on page 8). Its resistivity is measured by the conductivity sensor located inside the instrument. The
sample is then evacuated through the port labelled "OUT" (No. 12 in
Figure 1 on page 8).
Note: For improved system operation, the sample supply and drain should ideally be located above the "IN" and
"OUT" ports.
Sample IN connection
1. Push the retaining collar on the "IN" port using the key provided.
2. Remove the plug while keeping pressure on the collar.
3. Make a clean cut (90°) at one end of an 8 mm semi-rigid tube (or 6 mm if you are using the D8 to
D6 reduction sleeve). Use a PTFE tube for temperatures above 70 °C.
4. Insert the tube into the "IN" port.
5. Connect the other end of the tube to the sample supply.
Sample OUT connection
1. Push the retaining collar on the "OUT" port using the key provided.
2. Remove the plug while keeping pressure on the collar.
3. Make a clean cut (90°) at one end of an 8 mm semi-rigid tube (or 6 mm if you are using the D8 to
D6 reduction sleeve). Use a PTFE tube for temperatures above 70 °C.
4. Insert the tube into the "OUT" port.
5. Connect the other end of the tube to the drain for an in-line installation or the flow chamber
containing the sensor being tested for an off-line installation.
Installation in-line
If the system is in operation the instrument must be connected to the sample using a shut-off valve to
extract the sample. This requires a total distance D1 + D2 (see
Figure 2 ) of less than 2 meters and a
flow rate exceeding 20 L/hour (ideally 60 L/hour).
After opening the sample valve, wait at least 30 minutes to ensure all parts in contact with the sample
have been well rinsed and that the optimal thermal equilibrium between the sample, flow chamber
and conductivity sensor has been reached.
10 English